FOR IMMEDIATE RELEASE Contact: Dave Thomas, VP Marketing and Planning

       (307) 432-7000

Great Lakes Airlines To Add Weekend Flight Between Riverton, Wyoming and Denver, Colorado Beginning June 3, 2004

CHEYENNE, Wyo., May 20, 2004 � Great Lakes Aviation, Ltd. (OTC Bulletin Board: GLUX.OB � news) today announced that beginning June 3, 2004, it will increase weekend scheduled flights between Denver International Airport and Riverton, Wyoming to four round trips.

�Great Lakes is proud to announce this service increase for our customers in Riverton,� Charles R. Howell IV, CEO of Great Lakes, commented. �The growth in traffic we�ve seen between Riverton and Denver has been steady, and the comments we�ve received regarding the need for more frequency in the market leads us to believe this improvement in the schedule will result in more people enjoying the convenient service and economical fares we offer.�

All flights in the market are timed to make convenient connections with flights scheduled by Frontier Airlines and United Airlines from Denver.

Riverton � Denver Flight Schedule (Effective June 3, 2004)

Riverton to Denver:

Flight 5006  Departs   6:15am Arrives  7:33am Operates Monday-Saturday

Flight 5006 Departs  6:40am Arrives   7:58am Operates Sunday Only

Flight 5010 Departs 11:30am Arrives 12:48pm Operates Sunday & Saturday Only

Flight 5010 Departs 11:54am Arrives  1:12pm Operates Monday - Friday

Flight 5047* Departs   1:12pm  Arrives   2:30pm Operates Daily

Flight 5008 Departs  4:12pm Arrives  5:30pm Operates Sunday-Friday

Denver � Riverton Flight Schedule (Effective June 3, 2004)

Denver to Riverton:

Flight 5009  Departs   9:00am Arrives 10:22am Operates Monday-Friday

Flight 5009 Departs  9:45am Arrives 11:07pm Operates Saturday & Sunday Only

Flight 5046* Departs 11:30am Arrives 12:52pm Operates Daily

Flight 5007 Departs  1:15pm Arrives   2:35pm Operates Sunday-Friday

Flight 5007 Departs  4:15pm Arrives   5:37pm Operates Saturday Only

Flight 5011 Departs  9:05pm Arrives 10:27pm Operates Sunday-Friday

* = Operation on Weekend

Great Lakes is providing scheduled passenger service at 37 airports in 10 states with a fleet of Embraer EMB-120 Brasilia and Raytheon/Beech 1900D Regional Airliners.  A total of 174 weekday flights are scheduled at three hubs, with 164 flights at Denver, 4 flights at Minneapolis/St. Paul, and 6 flights at Phoenix. All scheduled flights are operated under the Great Lakes Airlines marketing identity in conjunction with code-share agreements with Frontier Airlines and United Airlines at their Denver hub.

Additional information is available on the company web site that may be accessed at www.greatlakesav.com

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